Engine suggestions
 

Hi guys!

I am purchasing a Senior Telemaster (94") ARF.
I intend to test a variety of electronics and imagery systems on it. The system could weigh upto 7 lbs.

I am thinking of using OS 1.20 AX or the Zeonah G 26.

Kindly suggest the better one.

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RE: Engine suggestions
 

For a video/photagraphy platform vibration needs to be minimized. It makes the video hard to watch and still photagraphy blurry. So an electric power system would be best. However, I cant stand the expense involved in electric and can justify batteries for a plane that size. So I would go with the Zenoah G-26 and work very hard at mounting the engine with shock absorbsion in mind (Rubber isolation mounts) to reduce vibrations through the airframe.

RE: Engine suggestions
 

Hey!

Thanks a lot..

I did consider the electric system. However, the problem was the weight of the entire system.

The system that I would be adding as the payload would be atleast 7 lbs.. and whatever electric configurations I could come up with were a bit on the heavy side.
The flight time that I am targeting is around 30 mins.

I felt that the AXi 5330/F3A is best suited for the purpose. However, the batteries proved to be a bit too heavy.
Can you suggest an alternative arrangement?

Also, would G20 be powerful enough for this system?





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RE: Engine suggestions
 

The Telemaster has a huge wing. So long as your runway is smooth the G20 should be able to get that plane up to flying speed in a reasonable distance even with your 7 lb payload.

RE: Engine suggestions
 

The Zen. G-26 will be ideal for you....it will sip gas and in its stock mag. form, be easy to start and no ign. batt. to have to charge. I wouldn't look any further for a powerplant!! You will not need any shock absorbing mounts either, balance your prop good and the huge airframe will soak up any further vibration. My G-26 is extremely smooth!!!

RE: Engine suggestions
 

If vibration is an issue, wouldn't a 4-stroke or an opposed twin be a better choice if electric is off the table?

RE: Engine suggestions
 

I don't think a single-piston four stroke runs any smoother than a single-piston two stroke. Why would it? Multi-cylinders are a different story.

I'm a gas or glow advocate usually, but the G-26 needs a bit of vibration so the diaphram pump will work. I believe it has even been recommended NOT to put a dampening motor mount on for that reason. (I can't remember where I read that - Bennett Built's website, perhaps but that might have had to do with a smoke pump installation). For a video platform I might be tempted to go with an electric motor, though I have avoided that route so far.

The alternative would be to go gas and put dampers on the camera mount. Now THAT sounds like the ideal solution.

RE: Engine suggestions
 

I was thinking that the frequency would be lower for a 4 stroke vs a two stroke, but the piston (probably the greatest source of vibration) would still be stroking the same number of times. There is some additional impulse shock from the fuel detonation which occurs 1/2 as often in a 4-stroke. The frequency of vibration is probably lower in a 4 vs a 2 stroke and therefore easier to dampen?

I agree that dampening the camera mount is the best way to go.